Question

以下代码效果很好：

def jsonLiveLeaderboard(request):

    data = StraightredFixture.objects.filter(fixturematchday=12)

    json_data = serializers.serialize('json', data)

    return HttpResponse(json_data, content_type='application/json')

但是，如果我尝试使用类似的自制查询：

def jsonLiveLeaderboard(request):

    cursor = connection.cursor()
    cursor.execute(
        """
            select username as User, floor((count(Goals)/2)-(if(sum(Loss)>0,1,0))) as Round, sum(Win) as Wins, sum(Goals) as Goals, sum(Loss) as Losses from
            (select u.username as username, s.campaignno as campaign, if(f.hometeamscore>f.awayteamscore,1,0) as Win, if(f.hometeamscore<f.awayteamscore,1,0) as Loss, f.hometeamscore as Goals from straightred_fixture f, straightred_userselection s, auth_user u where s.fixtureid = f.fixtureid and s.teamselectionid = f.hometeamid and s.user_id = u.id union all
            select u.username as username, s.campaignno as campaign, if(f.awayteamscore>f.hometeamscore,1,0) as Win, if(f.awayteamscore<f.hometeamscore,1,0) as Loss, f.awayteamscore as Goals from straightred_fixture f, straightred_userselection s, auth_user u where s.fixtureid = f.fixtureid and s.teamselectionid = f.awayteamid and s.user_id = u.id) t
            group by username, campaign
            having Losses = 0
            order by Round DESC, Wins DESC, Goals DESC
        """)

    pointsCurrentSeasonLive = cursor.fetchmany(size=8)

    json_data = serializers.serialize('json', pointsCurrentSeasonLive)


    return HttpResponse(json_data, content_type='application/json')

我收到以下错误：

AttributeError at /jsonLiveLeaderboard/
'tuple' object has no attribute '_meta'

是否有一种简单的方法可以将“自制”查询转换为json，就像使用本机Django查询一样？

非常感谢，艾伦。

Answer 1

serializers.serialize专门用于Django查询集。你只有一个列表，所以你应该使用标准的json库：

json_data = json.dumps(pointsCurrentSeasonLive)

Django本机查询v“自制”sql查询到json

1 个答案: